A Philadelphia attorney is facing a lengthy sanction for knowingly misrepresenting his status as the attorney for the father of a 12-year-old boy who was fatally shot by Philadelphia police.

On Monday, attorney J. Conor Corcoran agreed to an 18-month suspension, after he filed a civil lawsuit against the Philadelphia Police Department over the fatal shooting, despite not being retained by the father as counsel, and then later attempted to have the father declared mentally incompetent.

The Pennsylvania Supreme Court's order determined Corcoran had violated numerous Rules of Professional Conduct, and said his 18-month suspension would be effecting starting Oct. 30.